User-47214744 posted
the page you are showing above is not technically a redirect, it is using a Refresh technique that is commonly misused as a redirect. the thing that I would highly recommend is to NOT use that technique and instead use "real redirects", which are status
code 301, 302, or 307.
Using real redirects actually give semantic information to search engines, (ie is it permanent, temporary, etc), whereas refresh does not tell them anything. It is highly recommended to use standard HTTP status codes, since using this refresh as redirect
technique has in the past been associated with SPAM and might be confused.
So bottomline that is the reason why SEO Toolkit is still validating the response as a normal response, since technically the status code 200 means "OK".